According to your description, you are just an employee of the company, and your job responsibility is to be responsible for fire safety. So what you have to abide by is the regulations on employee behavior and job responsibilities according to the relevant documents of the company, such as employee handbook, employee job responsibilities, company safety standards, etc.

What you said about not signing an agreement with the company has three meanings. First, there is no labor contract between you and the company; Second, there is no agreement between your job-hopping and the company; Third, there is no labor contract between you and the company, and there is no agreement on this job-hopping. If you mean the first type, then you have the right to ask the company to sign a labor contract with you, and you also have the right to claim the double wage difference without signing a labor contract; If you mean the second type, if the company has appointed you, or if you two have reached an oral agreement, but there is no written agreement, then you should perform your job duties according to your post responsibilities. As long as the emergency is not caused by your own intention or negligence, you will not bear legal responsibility. The third case can be considered with reference to the first two suggestions.

I hope the above answers are helpful to you.